MATLAB Question.. Add noise to two codes below: clear all %% transmitter % -----

Question

MATLAB Question.. Add noise to two codes below:

clear all

%% transmitter

% ------>Digitizing

[y, Fs, nbits] = wavread('road.wav', 'double');

% Source Coding ---->Huffman Encoding:

% Channel Coding ----> Hamming Encoding:

%add noise

%% receiver

% Channel DeCoding ----> Hamming Decoding:

% Source DeCoding ----> Huffman Decoding:

% Mapping

------------------------------------------------------------------

clear all

%% transmitter

fid = fopen('sample.txt','r');

data = fread(fid);

data=reshape(data,1,87);

original_text= char(data);

chars = unique(data);%number of unique characters:

number_of_chars = length(chars);

% Source Coding ---->Huffman Encoding:

% Probability of characters are calculated with using formula:

% probability= usage of char / number of chars in text

probabilities = zeros(1,number_of_chars);

for k = 1:number_of_chars

  probabilities(k) = numel(find(data==chars(k)))/length(data);

end

chars_list=double(chars);

[dict,avglen] = huffmandict(chars_list,probabilities);% huffman dict is ready.

coded_data= huffmanenco(data,dict);% data is coded with huffman coding.

disp(length(coded_data))

% Channel Coding ----> Hamming Encoding:

[h,g,n,k] = hammgen(4);

add_zeros = horzcat(coded_data, [0 0]);

row = length(add_zeros)/11;

res_code=reshape(add_zeros, [row, 11]);

a = res_code*g;

coding = mod(a,2);

disp(coding)

size(coding)

x = reshape(coding,1,36*15)%with interleave

%frame

y = [0;1;1;0;1;0;1;0;1;0;0;1]'

if y in x

  disp('k')

else

  disp('l')

end

%synrome matrix

syndrome_matrix = [];

for i = 1:15;

error_matrix = zeros(15,1);

error_matrix(i)=1;

errors = h*error_matrix;

syndrome_matrix = horzcat(syndrome_matrix, errors);

end

%add noise

%% receiver

% Channel DeCoding ----> Hamming Decoding:

% Source DeCoding ----> Huffman Decoding:

decoded_data = huffmandeco(coded_data,dict);

%Received data is reshaped in order to get original data.

received_text= char(decoded_data);

disp('Decoded Text:')

disp(text)

fclose(fid);

Explanation / Answer

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